ci: fix missing newline escape

Author: joshmue

.github/workflows/vm-image.yml

@@ -337,6 +337,6 @@ jobs:
         run: |
           gh release create "$GITHUB_REF_NAME" \
             --title "$GITHUB_REF_NAME" \
-            --repo "$GITHUB_REPOSITORY"
+            --repo "$GITHUB_REPOSITORY" \
             --generate-notes \
             disk.tar.gz disk.tar.gz.sha256